Originally Posted by
Beanie
I haven't had a D4 but have owned a D3 and currently run a 3.0ltr RRS which is very similar mechanically to the D4.
They are great cars but are expensive to run around that age. The 7 year service is a big one as it included the cam belt and high pressure fuel pump which is at the back of the engine (it is timed and apparently awkward to change). Front lower and rear upper wishbone bushes wear and can cost £600 per axle as they can need cutting off. If the electronic parking brake is not properly maintained it will begin to screech and if not attended to, a new module will set you back about £800. The crank is the big one and there seems no rhyme or reason as to why they go. There are companies who can resurrect a dead engine dependent on the extent of the damage or you can get a new one from LR. Despite what LR say, the autobox will benefit from a flush around 70k as recommended by ZF who make them, budget about £300.
They can suffer from DPF regeneration/oil dilution issues if you only do short journeys, but that is a common issue with diesels with DPF's.
Not wishing to put you off as I will keep mine while I can afford it, but I would strongly suggest a comprehensive aftermarket warranty. A lot of owners use Warranty Direct as they will cover a snapped crank, which is not always the case. They have various levels of cover ranging £2-3,000 for 3 years which sounds a lot but gives you peace of mind.
Oh, and find a good independent specialist, the main dealers will just empty your wallet.
I'm sure FFF will be able to give you chapter and verse on these, the above is just what Iv'e picked up during LR ownership.